Komatsu PC130

[MinnesotaEric]

I have the grease solution. Put on a 12" hose for an excavator and you're set for field greasing.

 

[WoodChuckDad]

I have the grease solution. Put on a 12" hose for an excavator and you're set for field greasing.

I was thinking that same thing.

 

[kevin37b]

Make sure the hose from aircleaner to turbo is not collapsing under load .Have seen it happen .

 

[WoodChuckDad]

Make sure the hose from aircleaner to turbo is not collapsing under load .Have seen it happen .

I don't think that is happening. It appears to be fine. And the symptoms don't match a collapsing air line, because it is fine for the first couple minutes, then it dies out.

 

[WoodChuckDad]

Here is the readers digest of what I have done so far.
Change spin on fuel filter
drain fuel from tank
remove crud from tank
flush tank several times with diesel to get out crud residue
replace fuel line from tank
install inline fuel filter. A smaller one that is see thru
replace spin on fuel filter

The symptoms remain the same. After priming the lines, I can start it up, run for a few minutes and then it dies. I can prime it again, and it will immediately start running well for about 3 minutes. the last time I did this, since it was already warm, I just started digging at a stump. IT was fine for 2 minutes, 30 seconds. Then it crapped out.

Any ideas?

 

[farmer2009]

How much tank return are you getting?

I have a retired cat mechanic that's my go to when I get stumped. He says the injector pump should return 2/3 of the fuel it receives.

After priming if you remove the supply line at the injector pump. How long will it continue to run full? If about 2 minutes then you have a supply problem. Catch the fuel no sense in wasting it.

Is there a lift pump in the system? Is the primping pump also used during operation?

Did you make sure the tank shut off valve wasn't clogged?

Still a possibility the injector pump is headed out. Worst case I know.

 

[EddieWalker]

How does the fuel line go into the tank? Is there a metal tube in the tank with a screen on it?

You didn't mention taking apart the fuel pump. I guest it's possible, but I find it very hard to believe that there isn't a screen of some sort in the fuel pump.

What else does the fuel line connect to? At every fitting, you have the potential of some sort of blockage.

 

[WoodChuckDad]

How much tank return are you getting? I have a retired cat mechanic that's my go to when I get stumped. He says the injector pump should return 2/3 of the fuel it receives. After priming if you remove the supply line at the injector pump. How long will it continue to run full? If about 2 minutes then you have a supply problem. Catch the fuel no sense in wasting it. Is there a lift pump in the system? Is the primping pump also used during operation? Did you make sure the tank shut off valve wasn't clogged? Still a possibility the injector pump is headed out. Worst case I know.

How would I tell how much return I get?

 

[gghb]

the worst fuel problem i've ever had was caused by a factory tag wearing through a steel line on the suck side of the fuel pump sucked air but didn't leak fuel found it by pressureizing fuel tank and finding diesel spot on suck side

Greg

 

[WoodChuckDad]

How does the fuel line go into the tank? Is there a metal tube in the tank with a screen on it? You didn't mention taking apart the fuel pump. I guest it's possible, but I find it very hard to believe that there isn't a screen of some sort in the fuel pump. What else does the fuel line connect to? At every fitting, you have the potential of some sort of blockage.

Fuel line hoes into bottom of tank in the bowl Metal tube that sticks up a couple inches and out the bottom making an elbow for a couple inches. I noted that out and removed some crap from it but it is clear now. The line runs to the inline that I put in then to the injector ( I think it is the injector) I did not attempt to take the injector apart. I don't have a shop manual and wouldn't know where to begin.